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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#undef LOG_TAG
#define LOG_TAG "BufferStateLayerCache"
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "BufferStateLayerCache.h"
#define MAX_CACHE_SIZE 64
namespace android {
int32_t BufferStateLayerCache::add(const sp<IBinder>& processToken,
const sp<GraphicBuffer>& buffer) {
std::lock_guard lock(mMutex);
auto& processCache = getProccessCache(processToken);
int32_t slot = findSlot(processCache);
if (slot < 0) {
return slot;
}
processCache[slot] = buffer;
return slot;
}
void BufferStateLayerCache::release(const sp<IBinder>& processToken, int32_t id) {
if (id < 0) {
ALOGE("invalid buffer id");
return;
}
std::lock_guard lock(mMutex);
auto& processCache = getProccessCache(processToken);
if (id >= processCache.size()) {
ALOGE("invalid buffer id");
return;
}
processCache[id] = nullptr;
}
sp<GraphicBuffer> BufferStateLayerCache::get(const sp<IBinder>& processToken, int32_t id) {
if (id < 0) {
ALOGE("invalid buffer id");
return nullptr;
}
std::lock_guard lock(mMutex);
auto& processCache = getProccessCache(processToken);
if (id >= processCache.size()) {
ALOGE("invalid buffer id");
return nullptr;
}
return processCache[id];
}
std::vector<sp<GraphicBuffer>>& BufferStateLayerCache::getProccessCache(
const sp<IBinder>& processToken) {
return mBuffers[processToken];
}
int32_t BufferStateLayerCache::findSlot(std::vector<sp<GraphicBuffer>>& processCache) {
int32_t slot = 0;
for (const sp<GraphicBuffer> buffer : processCache) {
if (!buffer) {
return slot;
}
slot++;
}
if (processCache.size() < MAX_CACHE_SIZE) {
processCache.push_back(nullptr);
return slot;
}
return -1;
}
}; // namespace android
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